I'm trying to test LVM, but I failed on first, potentially simple task - create a snapshot.
I have following situation:
root@debian:~# vgs
VG #PV #LV #SN Attr VSize VFree
big 1 1 0 wz--n- 14.99g 5.68g
fast 1 2 0 wz--n- 14.99g 4.75g
and
root@debian:~# lvs
Internal error: Using string as sort value for numerical field.
Internal error: Using string as sort value for numerical field.
Internal error: Using string as sort value for numerical field.
LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert
home big -wi-ao-- 9.31g
root fast -wi-ao-- 9.31g
swap fast -wi-ao-- 952.00m
I'd like to make test snapshot of home, so Figured this will be the command to use:
lvcreate --size 1G -n snap -s /dev/big/home
But it fails with:
/dev/big/snap: not found: device not cleared
Aborting. Failed to wipe snapshot exception store.
Well, obviously there is no /dev/big/snap - I didn't make the snapshot yet.
/dev/big contains only link to home:
root@debian:~# ls -l /dev/big/
total 0
lrwxrwxrwx 1 root root 7 Nov 28 18:09 home -> ../dm-2
What am I missing in here?